My Leek 1660 was in Sandvik 14c26n, it looks like they are now using 440A which is a bit low on edge retention. I like my knife (not tough though). I would guess any coating will wear or scratch, it may change the way it feels peeling or cutting food. The coating is just on the sides, no edge help. I might consider coatings for non-stainless steels but the only reason on stainless would be "cool factor" or perhaps not looking like a mirror giving away your position to enemy that I am aware of.
David